一种新型上行SCMA系统接收机

doi:10.11959/j.issn.1000-0801.2017188

Abstract

Abstract:

Sparse code multiple access (SCMA) is a type of code domain non-orthogonal multiple access technology,which is regarded as a promising multiple access technology for 5G due to its excellent performance.The uplink SCMA system generally uses a message passing algorithm (MPA) in the receiver.The priori information can be inaccurated to cause an increased detection error.A novel receiver for the uplink SCMA system,called ring-MPA (R-MPA) receiver,was proposed to solve this problem,by using a joint detection process.The proposed R-MPA receiver was compared with the log-MPA receiver and the classic MPA receiver,two state-of-the-art existing schemes.Both theoretical analysis and computer simulation results show that the proposed receiver not only has a superior error performance,but also has a lower implementation complexity than these existing schemes.

Key words: 5G, sparse code multiple access, message passing algorithm, R-MPA, overloading factor

CLC Number:

TN929.5

Hongyang ZHANG,Changliang ZHENG,Genfu SHAO,Huaping LIU. A novel receiver for uplink SCMA system[J]. Telecommunications Science, 2017, 33(8): 138-144.

Figures/Tables 9

运算	MPA	log-MPA
加法运算	$\begin{array}{l} (2 d_{r} + 1) M^{d}^{r} K d_{r} n + (d_{v} - 2) M K d_{r} + 2 M K d_{r} \end{array}$	$3 M^{d_{r}} K d_{r}^{2} n + 2 M K d_{r}$
乘法运算	$(d_{r} + 2) M^{d}^{r} K d_{r} n + 4 M K d_{r}$	$3 M^{d}^{r} K d_{r} n + 4 M K d_{r}$
指数运算	$M^{d}^{r} K d_{r} n$	0
比较运算	0	$M^{d}^{r} K d_{r} n + (d_{v} - 2) M K d_{r} n$

References 17

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场景	接收机	J	K	系统过载率(OF)	迭代次数/次
1	log-MPA	6	4	150%	2
2	log-MPA	4	4	100%	4
3	log-MPA	6	4	150%	4
4	R-MPA	4	4	100%	4
5	R-MPA	6	4	150%	4

场景	接收机	J	K	系统过载率(OF)	迭代次数/次
1	R-MPA	4	4	100%	4
2	R-MPA	6	4	150%	4
3	MPA	4	4	100%	4
4	MPA	6	4	150%	4

A novel receiver for uplink SCMA system

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